v3.25.4
Income Taxes - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current tax assets $ 999 $ 1,070
Current tax liabilities $ 619 $ 453
Average effective tax rate 27.80% 27.80%
Deferred tax assets $ 5,741 $ 5,884
Deferred tax assets, recognition dependent on future taxable profits 173 27
Operating tax loss carry forward 8,152 4,837
Operating tax loss carry forward expired in future 5,342  
Operating tax loss carry forward without expiration date 2,810  
Capital tax loss carry forward 16 27
Tax benefit on loss carry forwards for which deferred tax asset recognized 1,353 851
Tax benefit of loss carry forwards for which no deferred tax asset recognized 472 356
Tax credit carry forwards which expire in future 476 412
Tax credit carryforwards of which benefit not recognized 166 174
Deferred tax liabilities 2,018 1,890
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements 11,709 14,955
Tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax asset for deductible temporary differences 908 1,152
Temporary differences [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 4,116 $ 5,341